diff --git a/apps/advanced/composer.json b/apps/advanced/composer.json
index 14487e3ccb..cb822d8830 100644
--- a/apps/advanced/composer.json
+++ b/apps/advanced/composer.json
@@ -15,15 +15,15 @@
     "minimum-stability": "dev",
     "require": {
         "php": ">=5.4.0",
-        "yiisoft/yii2": "*",
-        "yiisoft/yii2-bootstrap": "*",
-        "yiisoft/yii2-swiftmailer": "*"
+        "yiisoft/yii2": "~2.0.0",
+        "yiisoft/yii2-bootstrap": "~2.0.0",
+        "yiisoft/yii2-swiftmailer": "~2.0.0"
     },
     "require-dev": {
-        "yiisoft/yii2-codeception": "*",
-        "yiisoft/yii2-debug": "*",
-        "yiisoft/yii2-gii": "*",
-        "yiisoft/yii2-faker": "*"
+        "yiisoft/yii2-codeception": "~2.0.0",
+        "yiisoft/yii2-debug": "~2.0.0",
+        "yiisoft/yii2-gii": "~2.0.0",
+        "yiisoft/yii2-faker": "~2.0.0"
     },
     "config": {
         "process-timeout": 1800
diff --git a/apps/basic/composer.json b/apps/basic/composer.json
index 56756ec817..8479f76fe9 100644
--- a/apps/basic/composer.json
+++ b/apps/basic/composer.json
@@ -15,15 +15,15 @@
     "minimum-stability": "dev",
     "require": {
         "php": ">=5.4.0",
-        "yiisoft/yii2": "*",
-        "yiisoft/yii2-bootstrap": "*",
-        "yiisoft/yii2-swiftmailer": "*"
+        "yiisoft/yii2": "~2.0.0",
+        "yiisoft/yii2-bootstrap": "~2.0.0",
+        "yiisoft/yii2-swiftmailer": "~2.0.0"
     },
     "require-dev": {
-        "yiisoft/yii2-codeception": "*",
-        "yiisoft/yii2-debug": "*",
-        "yiisoft/yii2-gii": "*",
-        "yiisoft/yii2-faker": "*"
+        "yiisoft/yii2-codeception": "~2.0.0",
+        "yiisoft/yii2-debug": "~2.0.0",
+        "yiisoft/yii2-gii": "~2.0.0",
+        "yiisoft/yii2-faker": "~2.0.0"
     },
     "config": {
         "process-timeout": 1800
diff --git a/apps/benchmark/composer.json b/apps/benchmark/composer.json
index c8ed58953a..44191cc5e1 100644
--- a/apps/benchmark/composer.json
+++ b/apps/benchmark/composer.json
@@ -18,6 +18,6 @@
 	"minimum-stability": "dev",
 	"require": {
 		"php": ">=5.4.0",
-		"yiisoft/yii2": "*"
+		"yiisoft/yii2": "~2.0.0"
 	}
 }
diff --git a/extensions/apidoc/composer.json b/extensions/apidoc/composer.json
index 5ae25f76af..c1a1366342 100644
--- a/extensions/apidoc/composer.json
+++ b/extensions/apidoc/composer.json
@@ -19,8 +19,8 @@
     ],
     "minimum-stability": "dev",
     "require": {
-        "yiisoft/yii2": "*",
-        "yiisoft/yii2-bootstrap": "*",
+        "yiisoft/yii2": "~2.0.0",
+        "yiisoft/yii2-bootstrap": "~2.0.0",
         "phpdocumentor/reflection": ">=1.0.3",
         "phpdocumentor/reflection-docblock": ">2.0.1",
         "nikic/php-parser": "0.9.*",
diff --git a/extensions/authclient/composer.json b/extensions/authclient/composer.json
index 789259f4ba..4a9ac052c5 100644
--- a/extensions/authclient/composer.json
+++ b/extensions/authclient/composer.json
@@ -18,7 +18,7 @@
         }
     ],
     "require": {
-        "yiisoft/yii2": "*",
+        "yiisoft/yii2": "~2.0.0",
         "ext-curl": "*"
     },
     "autoload": {
diff --git a/extensions/bootstrap/composer.json b/extensions/bootstrap/composer.json
index 4a5da0d46b..b05e8494a7 100644
--- a/extensions/bootstrap/composer.json
+++ b/extensions/bootstrap/composer.json
@@ -18,7 +18,7 @@
         }
     ],
     "require": {
-        "yiisoft/yii2": "*",
+        "yiisoft/yii2": "~2.0.0",
         "bower-asset/bootstrap": "3.3.* | 3.2.* | 3.1.*"
     },
     "autoload": {
diff --git a/extensions/codeception/composer.json b/extensions/codeception/composer.json
index da0fb8ece5..35e5ddc808 100644
--- a/extensions/codeception/composer.json
+++ b/extensions/codeception/composer.json
@@ -17,7 +17,7 @@
         }
     ],
     "require": {
-        "yiisoft/yii2": "*"
+        "yiisoft/yii2": "~2.0.0"
     },
     "autoload": {
         "psr-4": { "yii\\codeception\\": "" }
diff --git a/extensions/debug/composer.json b/extensions/debug/composer.json
index 6edd31af17..3213759e43 100644
--- a/extensions/debug/composer.json
+++ b/extensions/debug/composer.json
@@ -18,8 +18,8 @@
         }
     ],
     "require": {
-        "yiisoft/yii2": "*",
-        "yiisoft/yii2-bootstrap": "*"
+        "yiisoft/yii2": "~2.0.0",
+        "yiisoft/yii2-bootstrap": "~2.0.0"
     },
     "autoload": {
         "psr-4": {
diff --git a/extensions/elasticsearch/composer.json b/extensions/elasticsearch/composer.json
index 5d3c3ab012..1838c88c2b 100644
--- a/extensions/elasticsearch/composer.json
+++ b/extensions/elasticsearch/composer.json
@@ -18,7 +18,7 @@
         }
     ],
     "require": {
-        "yiisoft/yii2": "*",
+        "yiisoft/yii2": "~2.0.0",
         "ext-curl": "*"
     },
     "autoload": {
diff --git a/extensions/faker/composer.json b/extensions/faker/composer.json
index 589cb1b251..6f84e5004b 100644
--- a/extensions/faker/composer.json
+++ b/extensions/faker/composer.json
@@ -17,7 +17,7 @@
         }
     ],
     "require": {
-        "yiisoft/yii2": "*",
+        "yiisoft/yii2": "~2.0.0",
         "fzaninotto/faker": "*"
     },
     "autoload": {
diff --git a/extensions/gii/composer.json b/extensions/gii/composer.json
index f1915eb95c..001eb496d9 100644
--- a/extensions/gii/composer.json
+++ b/extensions/gii/composer.json
@@ -18,8 +18,8 @@
         }
     ],
     "require": {
-        "yiisoft/yii2": "*",
-        "yiisoft/yii2-bootstrap": "*",
+        "yiisoft/yii2": "~2.0.0",
+        "yiisoft/yii2-bootstrap": "~2.0.0",
         "phpspec/php-diff": ">=1.0.2",
         "bower-asset/typeahead.js": "0.10.*"
     },
diff --git a/extensions/imagine/composer.json b/extensions/imagine/composer.json
index b695c35425..506cf75861 100644
--- a/extensions/imagine/composer.json
+++ b/extensions/imagine/composer.json
@@ -18,7 +18,7 @@
         }
     ],
     "require": {
-        "yiisoft/yii2": "*",
+        "yiisoft/yii2": "~2.0.0",
         "imagine/imagine": "0.5.*"
     },
     "autoload": {
diff --git a/extensions/jui/composer.json b/extensions/jui/composer.json
index 094e4196c6..3bde61f13d 100644
--- a/extensions/jui/composer.json
+++ b/extensions/jui/composer.json
@@ -18,7 +18,7 @@
         }
     ],
     "require": {
-        "yiisoft/yii2": "*",
+        "yiisoft/yii2": "~2.0.0",
         "bower-asset/jquery-ui": "1.11.*@stable"
     },
     "autoload": {
diff --git a/extensions/mongodb/composer.json b/extensions/mongodb/composer.json
index dfd441fdf3..3d2391e170 100644
--- a/extensions/mongodb/composer.json
+++ b/extensions/mongodb/composer.json
@@ -18,7 +18,7 @@
         }
     ],
     "require": {
-        "yiisoft/yii2": "*",
+        "yiisoft/yii2": "~2.0.0",
         "ext-mongo": ">=1.5.0"
     },
     "autoload": {
diff --git a/extensions/redis/composer.json b/extensions/redis/composer.json
index 6526e23308..61c0ab5066 100644
--- a/extensions/redis/composer.json
+++ b/extensions/redis/composer.json
@@ -18,7 +18,7 @@
         }
     ],
     "require": {
-        "yiisoft/yii2": "*"
+        "yiisoft/yii2": "~2.0.0"
     },
     "autoload": {
         "psr-4": { "yii\\redis\\": "" }
diff --git a/extensions/smarty/composer.json b/extensions/smarty/composer.json
index 15940f686b..f34b02f8a5 100644
--- a/extensions/smarty/composer.json
+++ b/extensions/smarty/composer.json
@@ -18,7 +18,7 @@
         }
     ],
     "require": {
-        "yiisoft/yii2": "*",
+        "yiisoft/yii2": "~2.0.0",
         "smarty/smarty": "*"
     },
     "autoload": {
diff --git a/extensions/sphinx/composer.json b/extensions/sphinx/composer.json
index b561ea9684..3762574d3e 100644
--- a/extensions/sphinx/composer.json
+++ b/extensions/sphinx/composer.json
@@ -18,7 +18,7 @@
         }
     ],
     "require": {
-        "yiisoft/yii2": "*",
+        "yiisoft/yii2": "~2.0.0",
         "ext-pdo": "*",
         "ext-pdo_mysql": "*"
     },
diff --git a/extensions/swiftmailer/composer.json b/extensions/swiftmailer/composer.json
index 409c710410..c20a84f842 100644
--- a/extensions/swiftmailer/composer.json
+++ b/extensions/swiftmailer/composer.json
@@ -18,7 +18,7 @@
         }
     ],
     "require": {
-        "yiisoft/yii2": "*",
+        "yiisoft/yii2": "~2.0.0",
         "swiftmailer/swiftmailer": "*"
     },
     "autoload": {
diff --git a/extensions/twig/composer.json b/extensions/twig/composer.json
index bf83535fce..9eb6a23490 100644
--- a/extensions/twig/composer.json
+++ b/extensions/twig/composer.json
@@ -18,7 +18,7 @@
         }
     ],
     "require": {
-        "yiisoft/yii2": "*",
+        "yiisoft/yii2": "~2.0.0",
         "twig/twig": "*"
     },
     "autoload": {